schwaiger



Aug. 11, 1959 o. L. SCHWAIGER ROT OR FOR A RADIAL BLOWER Filed May 20, 1955 01111.0 1,. SCHWAZGER a A9124; a6

United States Patent ROTOR FOR A RADIAL BLOWER Odilo L. Schwaiger, Stuttgart-Unterturkheim, Germany,

assignor to Daimler-Benz Aktiengesellschaft, Stuttgart- Unterturkheim, Germany I 1 Application May 20, 1955, Serial No.j509,951 In Germany March 17, 1950 Public Law 619, August 23, 1954 Patent expires March 17, 1970 6 Claims. (Cl. 230-134) My invention relates to a rotor for a radial 'blower which may be used for charging internal combustion engines. It is the object of the invention to provide a rotor of the kind indicated which combines light weight with great strength and is, therefore, capable of operation at a very high speed and is adapted to be produced from sheet metal by a simple andinexpensive pressing and welding operation. It is another object of the present invention to provide a rotor for a radial blower which is simple of design and is very efficient in operation.

Further'objects of my invention will appear from the description of a preferred embodiment-of the invention described hereinafter indetail with reference to the drawings, it being understood, however, that such detailed description serves the purpose of illustrating the invention rather than that of restricting or limiting the same.

In the drawings:

Fig. 1 illustrates a diagrammatical section through the rotor, the section being taken along the line 1-1 of Pi .2,

iig. 2 is a partial end View of the rotor viewed in the direction of the arrow 2 in Fig. 1, two of the three sheet metal plates being shown partly cut away to expose the internal structure of the rotor,

Fig. 3 is a sectional view, the section being taken along the line 3--3 of Fig. 2, and

Fig. 4 is a partial diagrammatical section taken along the line 44 of Fig. 2.

The rotor is composed of three annular sheet metal plates 10, 11 and 12. The first annular sheet metal plate is formed with an inner plane zone 13 surrounding the central opening 14 and with radial folds which are pressed into the plate 10 and start gradually outwardly from the zone 13 to the periphery 15. The height and the depth of the radial folds increase gradually from the inner zone 13 outwardly to points 16 where the height h and the depth d of the folds reach a maximum, such height and depth being measured from the plane 17 of the inner zone 13. The points 16 are located intermediate the inner zone 13 and the periphery 15. The folds taper again from points 16 outwardly towards the periphery 15,

From Fig. 2 it will appear that the folds constitute radial channels 18 of substantially uniform width w.

The second annular sheet metal plate 11 is of a flat frustro-conical shape. It is mounted on the left side of the sheet 10, when viewed as shown in Fig. 1, and is welded or otherwise secured to the crests 19 of the folds so as to close the channels 18 from the points 16 outwardly up to the periphery 15, leaving open the inner mouths 20 and the outer mouths 21 of the radial channels 18.

The third annular sheet metal plate 12 is slightly dishshaped and is mounted on the right hand side of the first plate 10 when viewed as shown in Fig. 1. It is secured by spot-welding or otherwise to the bottoms 22 of the factured by punching and pressing the sheet metal and 7 2,899,129 Patented Aug. 11, 19,59

channels 18 and thus covers the sector-shaped spaces 23 left between the channels 18.

From this description it will be understood that a The annular zone 13 is integral with a cylindrical hub portion 24 of the sheet metal plate 10.

The folds lend great rigidity to the sheet metal plate 10. The rigidity is further enhanced by the plates 11 and 12 Welded thereto. Therefore, the rotor in spite of its reduced weight has great strength and may be operated at a very high number of revolutions per minute. The three component parts 10, 11 and 12 may be easily manumay be assembled by spot-welding. The air entering in the direction of the arrow 2 in Fig. 1 will be gradually diverted from its axial path outwardly in radial direction. Owing to the smooth shape of the inner ends of the folds frictional losses of air pressure will be reduced to a minimum. In the radial channels 18 the air will be efficiently accelerated and its pressure will be increased. Since the therefrom so that no gap losses can occur. The inner ends of the crests of the folds constitute narrow ribs 25 which, acting as vanes, will engage the air entering the totor and will conduct the same uniformly and completely into the channels 18.

While the invention has been described in connection with a preferred embodiment thereof, it will be understood that it is capable of further modification, and this application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains, and as fall the scope of the invention or the limits of the appended claims.

What I claim is:

1. Rotor for a radial blower comprising a first annular sheet metal plate formed with radial folds constituting radial channels extending to the periphery thereof, a second annular sheet metal plate mounted on and secured to the crests of said folds on one side of said first sheet so as to close said channels except for the outer and inner ends thereof, and a third annular sheet metal plate mounted on the other side of said first plate and secured to the bottoms of said channels so as to cover the spaces between said channels, said first sheet having an undulated peripheral sectional profile and said second and said third sheet having smooth peripheral sectional profiles, said folds being so shaped as to form parallel side walls confining said channels, whereas said spaces between said channels are sector-shaped, the central aperture of said second annular sheet metal plate exposing the inner portions of said folds thereby establishing communication of said aperture with said radial channels.

2. Rotor as claimed in claim 1 in which the depth of said channels tapers outwardly, the distance of said second annular sheet metal plate from said third annular sheet metal plate decreasing accordingly towards the periphery of the blower.

3. Rotor as claimed in claim 1 in which said first annular sheet metal plate is formed with a plane annular zone surrounding its central opening, said folds flaring outwardly from said zone to a maximum height and depth at an intermediate point between said zone and said periphery and then tapering again from said intermediate point to said periphery.

4. Rotor as claimed in claim 3 further comprising a cylindrical hu'b integral with the portion of said first annular sheet metal plate forming said plane annular zone.

5. Rotor for a radial blower comprising a first annular sheet metal plate formed with an inner zone surrounding its central opening and with radial folds flaring outwardly from said zone to points of a maximum height and depth at intermediate points between said zone and the periphery of said plate, said folds forming parallel side walls confining radial channels of substantially uniform width, a second annular sheet metal plate mounted on and secured to the crests of said folds on one side of said sheet so as to close said channels, said second annular plate extending from said points outwardly leaving open the inner ends of said channels, and a third annular sheet metal plate mounted on the other side of said first plate and secured to the bottoms of said channels so as to cover the spaces therebetween, said spaces being sector-shaped.

6. Rotor for a radial blower comprising a first annular sheet metal plate formed with an inner flat circular zone surrounding its central opening and located within a plane and formed with radial folds extending outwardly from said zone and being intersected by said plane, the crests of said folds being located on one side of said plane and being spaced a first distance therefrom and the bottoms of said folds being located on the other side of said plane and being spaced a second distance therefrom, both of said distances increasing gradually outwardly from said zone to points located on a circle inside of the periphery of said first annular sheet metal plate and gradually decreasing outwardly of said circle, said folds forming par- 4 allel side walls confining radial channels of substantially uniform width, a second annular sheet metal plate mounted on and secured to the crests of said folds and having a central circular aperture of a diameter substantially equalling that of said circle, said aperture exposing the inner portions of said folds thereby establishing communication of said aperture with said radial channels which are closed by said second annular sheet metal plate, and a third annular sheet metal plate mounted on the other side of said first plate and secured to the bottoms of said channels so as to cover the spaces therebetween, said spaces being sector-shaped.

References Cited in the file of this patent UNITED STATES PATENTS 1,116,194 Wynn Nov. 3, 1914 1,214,812 Meredith et al. Feb. 6, 1917 1,897,947 Howell Feb. 14, 1933 2,034,302 Kohler Mar. 17, 1936 2,540,136 Oliphant Feb. 6, 1951 2,556,676 Carnegie June 12, 1951 FOREIGN PATENTS 8,454 Great Britain of 1910 16,619 Great Britain of 1890 206,801 Germany Feb. 11, 1909 250,542 Great Britain of 1927 368,563 Germany Feb. 6, 1923 419,252 Great Britain Nov. 8, 1934 823,477 Germany Dec. 3, 1951 

